I think I have the tagger installed correctly, and I've been able to add tags to a few blog entries.

The Portal cloud and page clouds both return perfectly.

At some level, the module knows how many pages are assosciated with each tag, because the changes in font size are working just fine.

But, my tag list page doesn't return any results.

any clues?

our site is here ---> http://www.chicagodatasolutions.com/

OK just to follow up on that one, I've done a clean install of the Tagger module, and set up some two-word tags.  On my system (also running Url Master) the Tag Urls are coming out with a '+' between them, not '_'. 

I have the '_' character for my replace space option in Url Master - but this option doesn't affect values in the parameters of a page url - only the page name itself.  In other words : the url master settings for replace space have nothing to do with the Tag values in the Url.